Grinding-machine.



PATENTED MAR. 12, 1907. W.'J. MUNOASTER & L. A. FLETCHER.

GRINDING MACHINE. APPLICATION HLBD own. 1905.

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THE NORRIS PETERS 0b., WASHINGTON, n. c.

I PATENTED MAR. 12, 1907. W. JLMUNCASTER &'L. A. FLETCHER.

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. v: Q Wu v z if GRINDING MACHINE. APPLICATION FILED OOT.11, 1905.

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UNITED STATES PATENT OFFICE.

WALTER J. MUNCASTER AND LAWRENCE A. FLETCHER, OF CUMBERLAND, MARYLAND.

GRINDING-MACHINE.

Specification of Letters Patent.

Patented March 12, 1907.

Application filed October 11, 1905 Serial No. 282,338.

To all whom it may concern:

Be it known that we, WALTER J. MUN- cAsTER and LAWRENCE A. FLETcnER,citizens of the United States, residing at Cumberland, in the county ofAllegany and State of Maryland, have invented certain new and usefulImprovements in Grinding- Machines, it of which the following is aspecification.

This invention has reference to a machine for grinding the mouths oredges of tumblers and like objects, and is in the nature of animprovement upon the machine set forth in an application filed on the thday of December, 1904,.in the joint names of Walter J. Muncaster andLawrence A. Fletcher, and designated by Serial No. 237,697.

The primary object of the present improvements is to simulate as nearlyas practicable the operation of hand-grinding or grinding the glassWhile held and pressed into contact with thegrinding-wheel by the handof the operator. The distinctive characteristics of such grinding are alight pressure at the outset and a progressively heavier pressure as thesmaller protuberances or irregularities of the glass or other object arecut away and the object obtains a more extended bearing upon thegrinder.

As the present invention is confined to mechanism for controlling themovements of the glass carrier or'chuck, we have illustrated and shalldescribe only so much of the machine as is necessary to a clearcomprehension of said devices. In fact, this feature may be employed inconnection with any suitable grinding mechanism, and it is our purpose,therefore, to claim it quite broadly and without restriction to itscombination with the specific grinding mechanism here shown.

In the accompanying drawings, Figure 1 j is a side or end elevation ofour machine with portions broken away or in section to better show theirconstruction and arrangement. Fig, 2 is a perspective view of themechanism by which the movements of the chuck or holder are produced andcontrolled. Fig. 3 is a side elevation of the same with portions brokenaway, the view bein taken from the side opposite that from whidh Fig. 2is taken. Fig. 4 is a section on the line 4 4 of Fig. 3, designed toshow the manner of making the roller-bearing for the shifting weight andthe adjustable connections. between shaft mounted therein and receivingmotion in any convenient manner from a suitable prime motor, and C acam-shaft which in practice is preferably driven throu h suitablegearing connecting it with shaft though it may be independently driven,if preferred.

, In the previous application, above mentioned,

a shaft carrying a worm or screw and receivin motion through beveledgearing from s aft B meshes with and turns a wormwheel mounted upon theshaft C, thereby giving to said shaft a quite slow motion as comparedwith shaft B.

Mounted in suitable boxes or hearings in the upper part of the frame Aand at the forward side thereof is a rotatable shaft D, provided with aband-wheel E, which is rotated by a belt F, passing about a band-pulleya, mounted upon shaft B, and about guiding and directing pulleys be,suitably mounted upon the frame A. Shaft D carries at its lower end agrinding wheel or disk F, which is provided with a shell or casing G toconfine the water used upon the grinding-disk and to deliver the same toa suitable outlet-pi e d, water being supplied to the eriphery 0 thestone by a pipe 6 and to the ower face of the stone by a pipe f, whichlatter passes centrally through the shaft D. Shaft D is under theconstruction shown held against longitudinal movement. hence the stone Frotates in a fixed plane or at a constant height.

Mounted and guided upon ways 9 on the front of the frame A is a slide H,carrying a two parallel members, as plainly seen in Fig. 2, thisconstruction permitting an antifrictionroller 7c to be mounted upon thepin or axle passing through and between the arms, said roller serving asa bearing-surface for the cam L, which actuates the lever K.

The rear arm 9' of lever K is weighted, as will be presently explainedmore in detail, to cause the elevation of the arm 2', and consequentlyof the slide H and chuck I, and this weighting of the lever causes theroller 7c to be held constantly in contact with the operative face ofcam L, or, in other words, to bear constantly against and follow themovements of said cam.

If the weight were fixed upon the arm j of lever K, it would exert asubstantially constant lifting force up on the slide H, such forcevarying only as the curved path of movement of the weight carries saidweight farther from the vertical plane of the axis of its fulcrum, avariation which with the actual movements of the lever would berelatively small. l/Ve therefore employ a shifting weight M for saidlever K and control its movements in one direction by a cam N and in theopposite direction by giving to the arm j such a shape or inclination ascauses the weight to tend constantly to move toward the fulcrum of leverK. As it is not entirely convenient in the type of machine hereillustrated to place the cam N in position to act directly upon theshifting weight M, we employ between said weight and the cam connectingor actuating devices comprising a swinging lever O and a connecting-linkP. In order to vary the range of movement of the weight, the connectionbetween link P and swinging lever O is made adjustable toward and fromthe center or axis of motion of the lever, and in order to determine andvary the initial position or the point from which the weight begins tomove outward upon the arm of lever K an adjustable connection isprovided between the weight and said link P. These features will bedescribed in detail later on.

Referring again to Fig. 1, it will be seen that the swinging lever O ispivoted or fulcrumed at its upper end in or upon a bracket Q, secured tothe frame of the machine, and hangs downward in rear of cam N, but outof line therewith, said arm or lever being provided with alaterally-projecting stud or pin carrying an antifriction-roller Z,which is in vertical plane with the cam N and rests against theperiphery of said cam. From the opposite side of the arm or lever Oprojects a second pin or bolt m, which forms a pivotal connection forthe link P, and in order that this connection may be made nearer to orfarther from the pivot-bolt or fulcrum n of arm or lever O said arm orlever is provided with a longitudinal T-slot 0, (seen in Figs. 3 and 5and indicated by dotted lines in Fig. 1,) a bushing p being placed uponthe pm at any desired point in the slot 8.

shank or stem of the pin m, so that the washer 9 may not be pressed intotoo close contact with and bind the link P when the nut 1' is screweddown upon the stem or bolt m to bind the head of the bolt in the slot ofarm O. By loosening the nut r the bolt m may be moved lengthwise of saidslot and tightened at any desired point; but the bushing p, serving as aspacing member, will prevent the link P from being bound or clamped andwill leave it free to rock upon its pivot. Similarly, it is desirable topermit adjustment of the weight M relatively to the link, for whichpurpose said weight is provided with a T- slot 8, and the connecting pinor bolt t has its head mounted in said slot and is provided with abushing 11., Fig. 4, which bushing is seated within the hole or openingin the rear end of link P and permits the latter to rock or pivotthereon, though the tightening of the nut userves to clamp the bolt orpivot- If preferred, however, the link may be slotted, as shown in Fig.3, and the pin or bolt it made stationary in the weight, in which casethe bolt will be shouldered to prevent the nut screwing down so far asto clamp the link P. If both the link and the weight be slotted, it willof course be necessary to employ two concentric bushings, the outer one,a, shorter than the inner one, u, and to clamp the slotted end of thelink P between the flanged end of its bushing and the clamping-nut, theinner bushing being constructed and arranged precisely as the bushing pof Fig. 5 and serving to clamp or bind the bolt in the slot 8 of theweight.

The arm y' of lever K is inclined upward from a point near the fulcrumof the lever to. ward its rear end, the inclination being such that whenthe slide H is at its highest elevation there shall still be aconsiderable tendency of the weight to slide or move inward toward thefulcrum of the lever. this movement easier and more certain, the weightis preferably furnished with antifriction-sleeves to bear upon the upperedge of the arm These sleeves may be arranged as shown in Figs. 1, 2, 3,and 4. By referring to the last-mentioned figure it will be seen thattwo tubular plugs or cylinders are driven or forced into a circularopening extending from face to face of the weight, the conjoint lengthof said plugs being somewhat less than the measurement of the weightfrom face to face. These plugs being made flush with the outer faces ofthe weight, there is left between them a space equal to or slightlygreater than the thickness or edge face of the arm of lever K, andwithin this space or cavity is arranged a circular series of rollers to,which encircle a pin or rod 1 the rollers in turn being encircled by acollar or sleeve w. (See Fig. 4.) The sleeve to, resting directly uponthe upper face of the arm To make j and being free to circle about therod y, will roll upon the arm 3', thus giving an easyrolling frictionupon the arm j instead of a sliding or rubbing friction. Two suchroller-supported sleeves w are employed, so that the weight has properbearing and support upon the arm j of the lever K and may ride freelyback and forth.

The parts being thus constructed and motion being imparted to shafts Band O, the operation is as follows: At the outset of the operation theslide H is depressed or lowered, the outer extremity of cam L at suchtime standing directly over and bearing upon the roller is, and therebyholding the slide momentarily depressed. In the machine as actuallyconstructed provision is made for locking down this slide; but this maybe used or omitted, as preferred, and as it constitutes no part of thepresent invention is not here illustrated. The glass J being introducedinto the chuck or holder I and shaft C continuing to rotate, the endportion of the cam L rides off the roller is and brings that portion ofits edge or periphery extending from the end inward toward the hubopposite the roller, which roller, as before mentioned, is kept normallyin contact with the peripheral face of the cam by the weight M, tendingto elevate the arm 0'. of the lever K. This permits the slide H to risesomewhat quickly; but as the weight M is at such time relatively nearthe fulcrum of the lever K it exerts slight upward pressure upon theslide, sufficient only to overcome the weight of the slide and attendantparts and the glass carried thereby. The grinding begins under thislight pressure, and the rough edges and slight projections orirregularities are rapidly ground away with such light pressure. The camL continuing its movement in the direction indicated by the arrow inFig.1, leaves roller It, so that the glass may rise un-- der the influenceof weight M to whatever extent the grinding of its'edge necessitates.This action continues under the light pressure until suflicient timehaving elapsed to remove the smaller projections and to grind the edgedown to a comparatively regular face capable of withstanding withoutinjury further pressure and harder grinding, the cam N comes into play,and its periphery, which is of gradually-increasing radius, bearsagainst the roller Z of arm or lever O and moves the same rearwardly.This move ment of the arm 0, by reason of the interposed or connectinglink P, moves weight M rearwardly upon the arm of lever K, giving tosaid weight increased leverage, and consequently increased efficiency orlifting effect, upon the slide H and the glass J, carried in the chuckor holder. The curvature of the cam N is such as to cause this movementof the Weight M to take place somewhat gradually and to increase thepressure of the glass against the stone progressively and in proportionto the increasing contact-surface of the glass upon the stone. Thisprogressive increase continues or may continue through from, say, afifth to a quarter of a revolution of the cam N, fromv which point theperipheral face of the cam is made concentric with the axis of the shaft0, so as to maintain from there to the end of its action in pressingback the arm O a constant effect. When the cam N has turned apredetermined distance in contact with roller Z, an approximately radialportion of the cam N is brought in front of roller Z and permits the arm0 to swing forward, the weight M rolling or sliding downward or forwardupon the arm y' of lever K and, through the connecting-link P, servingto swing or press the lever forward and to maintain the roller Z incontactwith the periphery of cam N. By this time cam L again comes intocontact with and presses down the roller 76, thereby lowering the slideH, with its chuck I and contained glass J, whereupon the whole cycle ofoperation is repeated.

In practice we provide a plurality of chucks or glass-holders, withtheir controlling-levers, weights, cams, &c., arranging the cams topermit the chucks to rise to working position in regular succession. Theattendant can by acting promptly remove finished glasses and supplyothers as fast as the chucks are depressed; but to guard againstinterruptions or inattention on the part of the. operator catches willpreferably be provided to hold the levers and chucks in their loweredpositions, as in our former application, to be released by the operator.

Mention has been made above of the slotting of both the Weight and thelink through which it is shifted. This provision is made in order thatthe initial position of the weight M and the setting of bolt m, by whichthe effective length of lever O is determined, may each be determinedwithout disturbing the other, as will now be explained.

Assuming that lever 0 be at its extreme forward throw, its rollerZresting against the circular or hub portion of cam L, link P may beswung about bolt t as a pivot without swinging or moving lever O, theslot 0 in said lever being an arc of a circle of which the axis of boltt is the center. It will likewise be seen that by adjusting bolt m inslot 0 of arm or lever O the effective length of said lever may bevaried as desired without shifting the initial position of weight M.Finally, it will be apparent that by varying the adjustment of bolt m,and thus determining the effective length of lever O, the extent ofmovement of weight M on arm 3' of lever K, and consequently the pressureexerted by said weight, will be determined and controlled.

Glasses vary in thickness, diameter, hardness, &c.. and a pressuresuitable for one lot ITO . other.

or grade of glasses will be unsuitable for an- It is therefore necessaryor at least desirable to vary the initial position of the weight M aswell as the range of its movement, the latter being proportionate to theeffective length of lever O, as above indicated. It is for the purposeof varying this initial position of weight M that the slot 8 isprovided, the weight being thus rendered adjustable without changing theposition of bolt t. In order to facilitate the initial setting of link Pand give the precise distance required between the bolts m and t, thelink is slotted at its rear end, as shown in Figs. 1 and 3, and, asabove mentioned, a double bushing u u is employed, permitting therequisite swiveling or pivotal action w thout i llpwing lost motionbetween the weight and in r.

Having thus described our invention, what we claim is- 1. In a machineof the character described, the combination of a grinding-wheel; a chuckor work-holder movable toward and from said wheel; a lever connectedwith and serving to move the chuck; a cam for moving said lever in onedirection; a weight for moving the lever in the opposite direction andmeans, substantially such as shown and described, for varying theposition of said weight relatively to the fulcrum of the leveras thegrindmg progresses.

2. In combination with a grinding-wheel, a chuck or work-holder, andmechanism for automatically moving the chuck toward the grinding-wheeland gradually or progress ively increasing the pressure of its containedwork against said wheel.

3. In combination with a grinding-wheel, a chuck or work-holder; a leverconnected with said chuck and serving to move the same toward thegrinding-wheel; a weight carried by said lever and serving to move itschuck-carrying arm toward the grindingwheel; and means for automaticallymoving said weight to increase its effect upon the lever as the chuckapproaches the grinding- Wheel.

4. In combination with a grindingwheel,

a chuck or work-holder; means for causing one of said members toapproach the other at predetermined rate; and automatic mechanism forpositively increasing the pressure of one of said members toward theother in definite and fixed relation to the rate of ap proach of one ofsaid members toward the other.

5. In a grinding-machine, the combination of a grinding-wheel; means forrotating said wheel; a chuck or work-holder; a lever fulcrumed betweenits ends; a connection between one arm of said lever and the chuck; aweight carried by the other arm of said lever; and a cam, serving tomove said weight relatively to the fulcrum of the lever, whereby itseffectiveness is varied as the grinding operation proceeds.

6. In a grinding-machine, the combination of a grinding-wheel; a chuckor work holder; a lever connected with and serving to move said chuck; acam for moving said lever in one direction; a weight for moving thelever in the reverse direction; and a cam for moving the weightrelatively to the fulcrum of the lever on which it is mounted,substantially as set forth.

7. In a grinding-machine, the combination of a suitable frame; ashaftmounted and rotatable in bearings in said frame; a grinding-wheelcarried by said shaft; a slide movable upon'ways on the frame, towardand from the grinding-wheel; a chuck or workholder carried by saidslide; a lever fulcrumed in the frame; a connection between said leverand the slide; a cam for moving the lever in one direction; a weightcarried by the lever and serving to move it in the opposite direction;and a second cam for moving the weight toward and. from the fulcrum ofthe lever 8. In combination with a suitable frame, and with a shaft Dmounted in hearings in said frame and provided with a grindingwlleel F,a slide H guided upon ways on the frame and provided with a chuck I; alever K fulcrumed in the frame; a rod h connecting one arm of said leverwith the slide H; a cam N serving to depress said arm of the lever; aweight M carried by the other arm of said lever; a swinging arm or leverO a link P connecting lever O and weight M; and a cam L serving to movethe lever O and tlfrough it to shift the weight M relatively to thefulcrum of lever K.

9. In combination with the grindingwheel and chuck or work-holder of agrinding-machine, a lever K connected with and serving to move the chucktoward and from the grinding-wheel a sliiftable weight carried by saidlever; a swinging lever having a slot curved in an arc of a circle fromthe axis of a stud or bolt carried by the Weight; a lmk eX- tending fromsaid bolt to the slotted lever; and a bolt connecting the lever and thelink and adjustable in said slot toward and from the fulcrum of thelever, as and for the purpose set forth.

10. In a grinding-machine, the combination of a grinding-wheel; a chuckor workholder movable toward and from said Wheel a lever having one armconnected with and serving to move the chuck, and having a second arminclining downward toward its fulcrum; a weight movable upon saidinclined arm of the lever; a swinging lever; a link connecting theweight and said swinging lever; and a cam serving to move the swinginglever and through it and the link to move the weight, the inclination ofthe lever-arm causing the weight to hold the swinging lever in contactwith its actuating-cam.

11. In a grinding-machine, the combination of a grinding-wheel; a chuckor workholder movable toward and from said wheel; a lever fulcrumedbetween its ends, having one arm connected with and serving to move thework-holder; means for actuating said lever; a weight carried by theother arm of the lever; a swinging arm or lever; a link connecting theweight with said swinging arm or lever; a connection between said linkand swinging arm or lever, adjustable toward and from the fulcrum of thelatter to vary the movement of the weight; and a cam serving to movesaid swinging arm or lever.

12. In a grinding-machine, the combination of a grinding-wheel; a chuckor workholder movable toward and from said wheel a lever for moving saidwork-holder; means for actuating said lever; a weight carried by saidlever and serving to urge the chuck toward the grinding-wheel;antifriction-rollers for said weight; and a cam serving to shift theweight upon the lever, relatively to the fulcrum of the latter.

13. In a grinding-machine, the combination of a grinding-wheel; a chuckor workholder movable toward and from the grind ing-Wheel; a leverconnected with and serving to move the work-holder; a weight carried byand serving to move in one direction said lever means for moving saidlever in the opposite direction; a lever for shifting the weight; a linkconnecting said lever and weight; and

means for initially adjusting the weight relatively to thefulcrum of itssupporting or carrying lever.

14. In a grinding-machine, the combination of a grinding-wheel; a chuckor workholder movable toward and from the grinding-wheel; a leverconnected with and serving to move the work-holder a weight carried byand serving to move in one direction said lever; means for moving saidlever in the reverse direction; a lever for shifting the weight upon itslever; a link connecting said weight and its shifting-lever; means forinitially adjusting the weight relatively to the fulcrum of itssupporting or carrying lever; and means for varying the effective lengthor throw of the weight-shifting lever.

15. In a grindingmachine, the combination of a grinding-wheel; a chuckor workholder movable toward and from the grinding-wheel; a leverconnected with and serving to move the work-h0lder a weight carried byand serving to move in one direction said lever means for moving saidlever in the opposite direction; a lever for shifting the weight uponits carrying or supporting lever and means for initially setting oradjusting the weight upon said lever In testimony whereof we have signedour names to this specification in the presence of two subscribinwitnesses.

W TEE J. MUNGASTER. LAWRENCE A. FLETCHER.

.Witnesses:

J. F. STARK, PAUL T. MENZEL.

